09/18/2026
NEW IN JACS: We've been waiting too long to call injured kids unstable.
WHY IT MATTERS: A 7-year-old with a systolic of 95 looks fine by PALS. This study says he's already at risk of dying.
THE STUDY: 233,490 injured kids ages 1 to 15, ACS TQIP 2018 to 2023. The authors worked backward from the data, asking what blood pressure, heart rate, and shock index actually separated the kids who died from the kids who lived.
THE HEADLINE FINDING: The blood pressure numbers that predicted death were 15 to 30 mmHg higher than the PALS hypotension numbers we teach.
PALS called 1.3% of these kids hypotensive
❗The new numbers called 8.7% of them at risk
❗Start worrying around 90 to 110 mmHg, not 72 to 90
WHAT DIDN'T CHANGE: Heart rate cutoffs matched what we already use for age-adjusted tachycardia. Shock index cutoffs landed right on SIPA. That's a national dataset backing up SIPA, which was originally built from just two hospitals.
YES, BUT: The models were only moderately predictive. One set of vitals on arrival, no prehospital data. The 1 to 2 year group was the messiest, probably from wrong-size BP cuffs, so don't change practice on that row.
THE BOTTOM LINE: Tachycardia is still the early warning we thought it was. Blood pressure is the one that's been lying to us. A normal pressure in an injured child is not reassurance, and waiting for PALS hypotension means waiting for the crash.
WHAT'S NEXT: Re-teaching medics, nurses, and physicians on what unstable looks like, and linking prehospital to hospital records so we're watching trends instead of one number at the door.
Note: Graph below recreated from details in the paper.
https://ow.ly/o5b350ZNPLz
